Adding a flange plate to a curved surface.

 From:  Frenchy Pilou (PILOU)
9654.20 In reply to 9654.19 
Planar the offsets part = create a plane surface between the 2 OffSeted parts! ;)
Kill the curves (Profil, rounded rectangles) Join the 2 Surfaces = Solide 2
Here just the Planar function :)